Released in 2010, the T-K4 improves upon many of the features from the T-K3. The T-K4 is one of Takagi"s smaller tankless water heaters. At 13.8 inches wide and weighing only 38 pounds, its ultra-compact design allows it to be mounted on a wall.Takagi"s newest tankless water heater also features an energy factor of 0.82, so it is extremely efficient and environmentally friendly. Since tankless water heaters only burn gas when hot water is needed, installing this unit can help homeowners save up to 45% on their monthly gas bills.Specifications: * Capacity: 2 to 3 Bathrooms * Flow Rate: Maximum 8.0 GPM * Gas Inputs: 11,000 to 190,000 BTU per hour * Energy Factor Rating: 0.82 * Inlet Gas Pressure: Min: 5.0" W.C. / Max 10.5" W.C. * Dimensions: 20.3" H x 13.8" W x 8.5" D * Direct Vent Capability * Electric Ignition Type: Natural Gas (NG)Installation Type: Indoor Only Direct Vent ConvertibleEnergy Factor: 0.82Vent Size: 4"Vent Type: Category III Stainless SteelInlet Gas Pressure: 5.0-10.5"W.C.Manifold Pressure: 2.0-2.5"W.C.Application: PlumbingHeight: 20.3"Width: 13.8"Depth: 8.5"Max Flow (GPM): 8.0Voltage:?Voltage, or volts, is a measurement of the difference between two electric fields (in heating terms, the difference between the Earth"s electrical field and the electricity running through your wires). 120 VACGas Input: 11000-190000 BTU/hWater Connection: 3/4"Gas Connection: 3/4"Temperature Range (F): 99?-167?FPSI Range: 15-150 psiWeight: 38 lbs